Oreo. Sandwich biscuit refers to a biscuit with a thin layer of cream, chocolate or other fillings between two biscuits, which tastes better. Purple sandwich cookies are called Oreos. Oreo was born in 19 12. This is a chocolate biscuit, mixed with various flavors of cream. It is the superstar of Kraft Foods, the king of biscuits and the synonym of chocolate sandwich biscuits all over the world.